Table 4.

Intraclass correlations (ICC) for assessments over time of the 5 global measures for the nonmanual and manual job groups.

Global MeasureNonmanual JobManual Job
NICCNICC
WPAI460.77*190.68*
WPS-RA460.78*190.76*
WAI460.77*190.67*
QQuantity450.75*180.53**
QQuality440.83*190.59**
QQTotal440.81*180.65*
HPQ question C450.67*190.39*

  • ↵* p ≤ 0.001;

  • ↵** p < 0 .01.

  • WPAI: Work Productivity and Activity Impairment Questionnaire; WPS-RA: Work Productivity Scale–Rheumatoid Arthritis; WAI: Work Ability Index; QQ: Quality and Quantity questionnaire; HPQ: World Health Organization Health and Work Performance Questionnaire;